自动获取屏幕尺寸信息的html文件

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>自动获取屏幕尺寸信息的html文件</title>
    <style>
        #testDiv {
            width: 100%;
            height: 100vh; /* 100% of the viewport height */
            background-color: lightblue;
            text-align: center;
            font-size: 2em;
            display: flex;
            justify-content: center;
            align-items: center;
        }
    </style>
</head>
<body>
    <div id="testDiv">
        宽度: <span id="width"></span>px, 高度: <span id="height"></span>px
    </div>

    <script>
        function updateSize() {
            const div = document.getElementById('testDiv');
            const width = div.offsetWidth;
            const height = div.offsetHeight;
            document.getElementById('width').textContent = width;
            document.getElementById('height').textContent = height;
        }

        window.onload = updateSize;
        window.onresize = updateSize;
    </script>
</body>
</html>